A lipsy
When a girl is super in love with a guy but acts like she doesn't care. She's a lying, fake, lipsy mess.
'She was lipsy and acted like she didn't like him, but I saw her looking at him all day.'
'She's the worst lipsy. She said she didn't like him, but she was following him everywhere.'
'She's a lipsy and she's so bad at it, she even told me she didn't like him.'